*{
    box-sizing: border-box;
}
a{
    font-style: normal;
    color: #000;
}
#nav-bottom-fixed{
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50px;
    background-color: #aaa;
}
#nav-bottom-fixed::after{
    content: "";
    display: block;
    clear: both;
}
#nav-bottom-fixed>div{
    text-align: center;
    width: 25%;
    height: 50px;
    font-size: 13px;
    /* line-height: 50px; */
    /* border: 1px solid black; */
    float: left;
}
#nav-bottom-fixed i{
    width: 100%;
    height: 30px;
    display: block;
    background-position: center center;
    background-repeat: no-repeat;
    background-size: 20px 20px;
}